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UP2516D and MST problem
Hi!
I recently bought 2x Dell UP2516D screens. The problem is that when I connect my U2410 cascaded to one of them, the signal at 1920x1200 is very unstable as you can see at the following link: (on the bottom the 2 2516 and top right the 2410).
I tried both using a precision M4800 with NVIDIA Quadro K2100M and a latitude E7240. The only viable workaround I've found until now is to force refresh of the screen to a custom 30Hz. I also can run tests on other machines but they don't have support for DP1.2/MST
PS: as I don't own a USB 3.0 version of the E-Port, I can only run tests using the display-port on the laptops.
Thanks for your help,
Alessandro
#IWorkForDell
DELL-Chris M
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February 7th, 2017 12:00
Explain in detail how all three monitors are connected to the one laptop DP (DisplayPort) out port listing all monitor ports used and cabling.
Have you removed one of the UP2516D's from the setup and tested like this to see if the U2410 works?
Laptop DP out port --> UP2516D DP to mDP cable --> UP2516D mDP in port (MST On, 2560x1440 60Hz)
UP2516D DP out port --> DP to DP cable --> U2410 DP in port (1920x1200 60Hz)
ATBert
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February 7th, 2017 19:00
Unluckily I own "only" two of those pretty boys :) the config you can see in the video features 2x 2516 on the bottom, a 2410 on top right and a 2707wfp on the top left (no hdmi, no DP, only DVI directly connected to the computer)
I have tried having the signal go through both of them before reaching the 2410 (which officially I think wouldn't be a supported config as their res is 2560x1440 and with MST the max number of monitors at that res is 2 whhile it goes up for resolutions up to 1920x1200) but anyway, the behavior doesn't change. And of course I tried with both monitors so the problem presents itself whether the first screen is 2516 nr 1 or 2516 nr 2. I can't try to put the 2410 as first because it doesn't feature a DP out.
I don'thave any other DP monitor but my guess would be that there's something in
A) the way the 2516 treat the signal
B) the way the 2410 interprets it
On which they do not really agree. The more I reduce the used badnwidth by lowering resolution and/or refresh rate) on the 2410, the more stable the image is.As mentioned before, if I create a custom resolution in NVidia Control Panel for 1920x1200@30Hz the image is stable but that's a work around and not a solution as, by model spec and DP/MST specs, all the screens should be fine @60Hz AFAIK.
Thanks again Chris!
Alessandro
DELL-Chris M
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February 8th, 2017 06:00
Four monitors being pushed by one laptop GPU? I doubt it can do what you want, all four monitors at maximum resolution and Hz. Perhaps a desktop computer with an updated video card has the horsepower to achieve this.
ATBert
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February 8th, 2017 07:00
forget the 4 screen configuration: the same problem happens even while using only the 2410 daisy chained to one of the 2516; same thing on a latitude E7240 with the integrated Intel Graphics which is why I am quite sure the problem lies within the monitors but I don't have such an arsenal to test other configurations but at least this proves the problem isn't the laptop/graphic card.
DELL-Chris M
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February 8th, 2017 08:00
Interesting. So in both of the below setups, the U2410 cannot do 1920x1200 60Hz?
Laptop DP out port --> #1 UP2516D DP to mDP cable --> UP2516D mDP in port (MST On, 2560x1440 60Hz)
#1 UP2516D DP out port --> DP to DP cable --> U2410 DP in port (1920x1200 60Hz)
Laptop DP out port --> #2 UP2516D DP to mDP cable --> UP2516D mDP in port (MST On, 2560x1440 60Hz)
#2 UP2516D DP out port --> DP to DP cable --> U2410 DP in port (1920x1200 60Hz)
Perhaps get a newer dock that has two DP 1.2 out ports.
Dock DP 1.2 out port --> #1 UP2516D DP to mDP cable --> UP2516D mDP in port (MST On, 2560x1440 60Hz)
#1 UP2516D DP out port --> UP2516D DP to mDP cable --> #2 UP2516D mDP in port (MST Off, 2560x1440 60Hz)
Dock DP 1.2 out port --> DP to DP cable --> U2410 DP in port (1920x1200 60Hz)
ATBert
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February 8th, 2017 08:00
That's even worse Chris! it's Laptop DP out port -> UP2516D ->dp cable->U2410H whether the laptop is the M4800 with Quadro K2100M or Latitude £7240 with integrated intel, the problem is exactly the same you can see in the video.
I already oredered the new dock (just to not have to connect/disconnect cables), but that's not the problem has the problem happens with the monitors connected to the laptop.
The other workaround (not acceptable: I'm only telling you as a troubleshooting test) is using the wireless D5000 (yes, I also have that and wi-gig in the M4800 :D ) to connect the U2410 instead of cascading it.